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| Analysis of the effect and influencing factors of hydroxyapatite on stabilizing soil cadmium and lead in site |
| Received:December 13, 2024 |
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| KeyWord:Cd;Pb;stabilization repair;hydroxyapatite;leaching concentration;site soil |
| Author Name | Affiliation | E-mail | | LIU Yiting | College of Land and Environment, Shenyang Agricultural University, National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | TIAN Chuqi | College of Land and Environment, Shenyang Agricultural University, National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | SU Yan | Shenyang Institute of Environmental Sciences, Shenyang 110167, China | | | WANG Jian | Shenyang Institute of Environmental Sciences, Shenyang 110167, China | | | OU Chenghao | College of Land and Environment, Shenyang Agricultural University, National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | GUAN Xiujing | College of Land and Environment, Shenyang Agricultural University, National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | DANG Xiuli | College of Land and Environment, Shenyang Agricultural University, National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | dxl@syau.edu.cn |
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| Abstract: |
| To evaluate the effects of various environmental conditions on the stabilization of cadmium（Cd）and lead（Pb）in soil of development land in Liaoning Province, indoor cultivation experiments were conducted using different doses of hydroxyapatite（1%, 2%, 4%, 8%）to remediate Cd-Pb contaminated soil. The leaching toxicity and occurrence forms of Cd and Pb in the soil were determined to screen for the optimal amount of hydroxyapatite for stabilization. Then, stabilized soil was leached using different pH values（2.0, 4.0, 5.5, 7.0, 8.0, 9.0, 10.5, 12.0, 13.0）and liquid-solid ratios（1∶1, 2∶1, 5∶1, 10∶1, and 20∶1）, and the leaching concentrations of Cd and Pb in the soil were determined to study the effect of hydroxyapatite on the stabilization of Cd and Pb under different environmental conditions. The results showed that compared with the treatment without hydroxyapatite, adding hydroxyapatite could reduce the leaching concentration of Cd in soil by 19.9%-64.4%（P<0.05）, and the leaching concentration of Pb by 36.0%-98.0%（P<0.05）. The stabilization effect of hydroxyapatite on Cd and Pb showed that Cd12.0）leaching, under neutral conditions（pH 5.5-10.5）, the leaching concentrations of Cd and Pb are lower, ranging from 0.003-0.293 mg·L-1 and 0.003-0.041 mg·L-1, respectively. Compared with higher liquid-solid ratio（5∶1, 10∶1, and 20∶1）, lower liquid-solid ratio（1∶1, 2∶1）increased the leaching concentrations of Cd and Pb. The leaching concentration of Cd and Pb was the lowest when the liquid-solid ratio was 5∶1. Research has shown that hydroxyapatite can effectively alter the occurrence forms of Cd and Pb in soil of site, thereby reducing the leaching concentration of Cd and Pb. Strong acid, strong alkali, and low liquid-solid ratio leaching increase the risk of Cd and Pb releaching from stabilized soil. |
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